Hyundai Ioniq: What to do in an emergency / If the 12 Volt Battery is Discharged (Hybrid Vehicle)

Hyundai Ioniq (AE) 2017-2021 Owner's Manual / What to do in an emergency / If the 12 Volt Battery is Discharged (Hybrid Vehicle)

Before Jump Starting

This vehicle does not have a regular 12V battery that needs periodic replacement. It is lithium ion polymer type integrated into the HEV high voltage battery. The vehicle has a 12V battery protection system that cuts 12V battery from vehicle draw to prevent full discharge.

Using the 12V Battery Reset Switch

Hyundai Ioniq. If the 12 Volt Battery is Discharged (Hybrid Vehicle)

1. Press the 12V Battery Reset switch to reconnect the 12V battery.

2. Start the vehicle within 15 seconds of pressing the 12V Battery Reset switch.

3. After starting vehicle (Hyundai Ioniq. If the 12 Volt Battery is Discharged (Hybrid Vehicle) indicator on), operate the vehicle safely outdoors in ready mode stopped and/or drive it for 30 minutes total to charge the 12V battery fully. If you do not start the vehicle immediately after pressing the 12V Battery Reset switch, the power of 12V battery is automatically disconnected after few seconds to save the 12V battery from additional discharge. If the 12V battery is disconnected prior to starting the vehicle, press the 12V Battery Reset switch again and then immediately start the vehicle as explained.

Repeated use of the 12V Battery Reset switch without a sufficient engine ON cycle (30 Min+) may cause over discharge of the 12V battery, which will prevent the vehicle from starting. If the 12V battery is over discharged to a point that the reset does not work, try to jump-start the vehicle.

Information

After starting the vehicle (Hyundai Ioniq. If the 12 Volt Battery is Discharged (Hybrid Vehicle) indicator on), the 12V battery is being charged whether the engine is running or not. Although there is no enginesound, it is unnecessary to depress the accelerator pedal.

The following items may need to be reset after the battery has been discharged or the battery has been disconnected. See chapter 3 or 4 for:

  • Power Windows
  • Trip Computer
  • Climate Control System
  • Clock
  • Audio System
  • Sunroof
  • Driver Position Memory System

NOTICE

External power source using 12V battery

The use of external power accessories may reduce performance and function of the vehicle. Especially, the use of dash cameras may shut off the power of the vehicle prior to the dash camera's automatic shut-down.

If the power of the vehicle is shut off, start the vehicle as explained. (refer to "Using the 12V Battery Switch")

If the Vehicle will not Start

Hybrid vehicle Be sure the shift lever is in P (Park). The vehicle starts only when the shift lever is in P (Park). This vehicle does not have a regular 12V battery that needs periodic replacement...

Jump Starting

In the event vehicle still does not have a functional 12V battery (check if interior lights will not turn on) then you can try a jump start to the engine compartment jumper terminals using a 12V booster pack or jumper cables from another vehicle's 12V battery according to the following instructions...

Other information:

Hyundai Ioniq (AE) 2017-2021 Owner's Manual: Scheduled Maintenance Services


Follow Normal Maintenance Schedule if the vehicle is usually operated where none of the following conditions apply. If any of the following conditions apply, you must follow the Maintenance Under Severe Usage Conditions. Repeated short distance driving...

Hyundai Ioniq (AE) 2017-2021 Owner's Manual: Pre-tensioner seat belt (Driver and front passenger)


Your vehicle is equipped with driver's and front passenger's Pre-tensioner Seat Belts (Retractor Pretensioner and Emergency Fastening Device System). The purpose of the pre-tensioner is to make sure the seat belts fit tightly against the occupant's body in certain frontal or side collision(s)...

Categories

Driver Position Memory System

Hyundai Ioniq. Driver Position Memory System

The Driver Position Memory System is provided to store and recall the following memory settings with a simple button operation.

- Driver's seat position
- Side view mirror position
- Instrument panel illumination intensity

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